和之前的ASP.NET MVC中的使用LOG4NET的方法有些不同，这里先记录一下，使用步骤如下 ：
1. 建立 ASP.NET CORE项目中，NUGET中搜索log4net后下载安装
2. 根目录建立 log4net.config文件，内容如下：
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<!-- This section contains the log4net configuration settings -->
<log4net>
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
<layout type="log4net.Layout.PatternLayout" value="%date [%thread] %-5level %logger - %message%newline" />
</appender>
<!--<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="log-file.log" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>-->
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="logfile/" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<staticLogFileName value="false" />
<datePattern value="yyyyMMdd'.log'" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="1MB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<!-- Setup the root category, add the appenders and set the default level -->
<root>
<level value="ALL" />
<appender-ref ref="ConsoleAppender" />
<appender-ref ref="FileAppender" />
<appender-ref ref="RollingLogFileAppender" />
</root>
</log4net>
</configuration>
3. Startup.cs文件中的Startup方法和ConfigureServices方法里的AddMvc代码改下，核心代码如下，记得引用相应的命名空间：
//log4net日志
public static ILoggerRepository repository { get; set; }
public Startup(IConfiguration configuration)
{
Configuration = configuration;
//加载log4net日志配置文件
repository = LogManager.CreateRepository("NETCoreRepository");
XmlConfigurator.Configure(repository, new FileInfo("log4net.config"));
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc(options =>
{
options.Filters.Add<Models.HttpGlobalExceptionFilter>(); //加入全局异常类
});
}
4. Models文件夹中建立 HttpGlobalExceptionFilter.cs 类，用于全局异常后记录到日志中，内容代码如下 ：
using log4net;
using Microsoft.AspNetCore.Mvc.Filters;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace WebApplication1.Models
{
/// <summary>
/// 全局异常类
/// </summary>
public class HttpGlobalExceptionFilter : IExceptionFilter
{
private ILog log = LogManager.GetLogger(Startup.repository.Name, typeof(HttpGlobalExceptionFilter));
public void OnException(ExceptionContext context)
{
log.Error(context.Exception);
}
}
}
5. 下面是控制器的代码，有异常会自动记录下来，用那个log也能手工记录日志信息
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using log4net;
using Microsoft.AspNetCore.Mvc;
using WebApplication1.Models;
namespace WebApplication1.Controllers
{
public class HomeController : Controller
{
private ILog log = LogManager.GetLogger(Startup.repository.Name, typeof(HttpGlobalExceptionFilter));
public IActionResult Index()
{
throw new Exception("牛腩自定义异常！！！"); //有异常则会记录到logfile文件夹中
return View();
}
public IActionResult About()
{
ViewData["Message"] = "Your application description page.";
log.Info("打开about页面了！！！"); //普通的记录日志
return View();
}
}
}
